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vtkext/private/module/CMakeLists.txt

@@ -62,8 +62,8 @@ if(NOT VTK_VERSION VERSION_GREATER_EQUAL 9.2.20220907)
   set(classes ${classes} vtkF3DOrientationMarkerWidget)
 endif()
 
-if(WIN32 AND F3D_WINDOWS_GUI)
-  list(APPEND classes vtkF3DWin32OutputWindow)
+if(WIN32)
+  list(APPEND classes vtkF3DWin32OutputWindow vtkF3DWGLRenderWindow)
 endif()
 
 if(ANDROID)

vtkext/private/module/vtkF3DWGLRenderWindow.cxx

@@ -0,0 +1,103 @@
+#include <vtkObjectFactory.h>
+
+#include "vtkF3DWGLRenderWindow.h"
+
+#include <Windows.h>
+#include <dwmapi.h>
+
+#ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
+#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
+#endif
+
+constexpr auto IMMERSIVE_DARK_MODE_SUPPORTED_SINCE = 19041;
+
+namespace
+{
+  /**
+   * Helper function to detect if the
+   * Windows Build Number is equal or greater to a number
+   */
+  bool IsWindowsBuildNumberOrGreater(int buildNumber)
+  {
+    std::string value;
+    bool result = vtksys::SystemTools::ReadRegistryValue(
+      "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows NT\\CurrentVersion;CurrentBuildNumber",
+      value);
+
+    if (result == true)
+    {
+      try
+      {
+        return std::stoi(value) >= buildNumber;
+      }
+      catch (const std::invalid_argument&)
+      {
+      }
+    }
+
+    return false;
+  }
+
+  /**
+   * Helper function to fetch a DWORD from windows registry.
+   *
+   * @param hKey A handle to an open registry key
+   * @param subKey The path of registry key relative to 'hKey'
+   * @param value The name of the registry value
+   * @param dWord Variable to store the result in
+   */
+  bool ReadRegistryDWord(
+    HKEY hKey, const std::wstring& subKey, const std::wstring& value, DWORD& dWord)
+  {
+    DWORD dataSize = sizeof(DWORD);
+    LONG result = RegGetValueW(
+      hKey, subKey.c_str(), value.c_str(), RRF_RT_REG_DWORD, nullptr, &dWord, &dataSize);
+
+    return result == ERROR_SUCCESS;
+  }
+
+  /**
+   * Helper function to detect user theme
+   */
+  bool IsWindowsInDarkMode()
+  {
+    std::wstring subKey(L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize");
+
+    DWORD value{};
+
+    if (::ReadRegistryDWord(HKEY_CURRENT_USER, subKey, L"AppsUseLightTheme", value))
+    {
+      return value == 0;
+    }
+
+    if (::ReadRegistryDWord(HKEY_CURRENT_USER, subKey, L"SystemUsesLightTheme", value))
+    {
+      return value == 0;
+    }
+
+    return false;
+  }
+}
+
+//------------------------------------------------------------------------------
+vtkStandardNewMacro(vtkF3DWGLRenderWindow);
+
+//------------------------------------------------------------------------------
+vtkF3DWGLRenderWindow::vtkF3DWGLRenderWindow() = default;
+
+//------------------------------------------------------------------------------
+vtkF3DWGLRenderWindow::~vtkF3DWGLRenderWindow() = default;
+
+//------------------------------------------------------------------------------
+void vtkF3DWGLRenderWindow::WindowInitialize()
+{
+  this->Superclass::WindowInitialize();
+
+  // set dark mode if necessary
+  if (::IsWindowsBuildNumberOrGreater(IMMERSIVE_DARK_MODE_SUPPORTED_SINCE))
+  {
+    HWND hwnd = this->WindowId;
+    BOOL useDarkMode = ::IsWindowsInDarkMode();
+    DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE, &useDarkMode, sizeof(useDarkMode));
+  }
+}

vtkext/private/module/vtkF3DWGLRenderWindow.h

@@ -0,0 +1,30 @@
+/**
+ * @class   vtkF3DWGLRenderWindow
+ * @brief   WGL context render window
+ */
+
+#ifndef vtkF3DWGLRenderWindow_h
+#define vtkF3DWGLRenderWindow_h
+
+#include "vtkWin32OpenGLRenderWindow.h"
+
+class vtkF3DWGLRenderWindow : public vtkWin32OpenGLRenderWindow
+{
+public:
+  static vtkF3DWGLRenderWindow* New();
+  vtkTypeMacro(vtkF3DWGLRenderWindow, vtkWin32OpenGLRenderWindow);
+
+  /**
+   * Override to decorate with dark theme if needed.
+   */
+  void WindowInitialize() override;
+
+protected:
+  vtkF3DWGLRenderWindow();
+  ~vtkF3DWGLRenderWindow() override;
+
+private:
+  vtkF3DWGLRenderWindow(const vtkF3DWGLRenderWindow&) = delete;
+  void operator=(const vtkF3DWGLRenderWindow&) = delete;
+};
+#endif // vtkF3DWGLRenderWindow_h